--- a/nmake.opt	Fri Dec 14 22:34:20 2018
+++ b/nmake.opt	Wed Mar 27 11:00:00 2019
@@ -133,7 +133,17 @@
 
+# Flags to choose CRT variant to link against (e.g. static: /MT, /MTd, dynamic: /MD, /MDd)
+# Ensure MRSID_CONFIG in mrsid/nmake.opt is set appropriately as well
+!IFNDEF CXX_CRT_FLAGS
+!IFNDEF DEBUG
+CXX_CRT_FLAGS=/MD
+!ELSE
+CXX_CRT_FLAGS=/MDd
+!ENDIF
+!ENDIF
+
 !IFNDEF OPTFLAGS
 !IF "$(DEBUG)" == "0"
-OPTFLAGS= $(CXX_ANALYZE_FLAGS) $(CXX_PDB_FLAGS) /nologo /MP /MD /EHsc /Ox /FC /D_CRT_SECURE_NO_DEPRECATE /D_CRT_NONSTDC_NO_DEPRECATE /DNDEBUG
+OPTFLAGS= $(CXX_ANALYZE_FLAGS) $(CXX_PDB_FLAGS) /nologo /MP $(CXX_CRT_FLAGS) /EHsc /Ox /D_CRT_SECURE_NO_DEPRECATE /D_CRT_NONSTDC_NO_DEPRECATE /DNDEBUG
 !ELSE
-OPTFLAGS= $(CXX_ANALYZE_FLAGS) $(CXX_PDB_FLAGS) /nologo /MP /MDd /EHsc /FC /D_CRT_SECURE_NO_DEPRECATE /D_CRT_NONSTDC_NO_DEPRECATE /DDEBUG
+OPTFLAGS= $(CXX_ANALYZE_FLAGS) $(CXX_PDB_FLAGS) /nologo /MP $(CXX_CRT_FLAGS) /EHsc /D_CRT_SECURE_NO_DEPRECATE /D_CRT_NONSTDC_NO_DEPRECATE /DDEBUG
 !ENDIF